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I import an IFC file from another CAD program in RSTAB or RFEM by using the CAD / BIM option. During the conversion, I receive error messages. Likewise, the members will not be converted correctly.


CAD programs that are not primarily structural analysis usually model structural elements as solids. A simple rectangular column would consist of 12 lines and 6 surfaces, for example (see Figure).

The solids can also be defined in different ways. Either over the boundary surfaces (BREP) or as a "drawn solid", so to speak (Swept Solid). The difficulty now is to generate a 1D element from this 3D element. This is usually only possible if the solids were created as Swept Solid. The "Face" surface defines the cross-section. We can determine the correct member position by means of the direction and length of the extrusion.

However, in your case, it is a BREP. For the moment, we can not guarantee the correct conversion for this type. This also applies to the warning that should appear during the import.


IFC BREP SweptSolid CAD BIM Import Export

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RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

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RSTAB 8.xx

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The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

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